Studio Technologies StudioComm 50 User manual

Brand: Studio Technologies

Model: StudioComm 50

Type: User manual

50060-895, Issue 3

Model 50 Central Controller,

Model 51 Control Console,

and Related Components

User Guide

Issue 3, August 1995

This Service Guide is applicable for serial numbers:

Model 50 M50-00133 and later

Model 51 M51-00131 and later

5520 West Touhy Avenue

Skokie, Illinois 60077 U.S.A.

Telephone (847) 676-9177

Fax (847) 982-0747

www.studio-tech.com

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Model 50/51 User Guide Issue 3, August 1995

Studio Technologies, Inc. Page 3

Table of Contents

Foreword...................................................................... 5

Introduction .................................................................. 7

What This User Guide Covers ................................. 7

System Overview ..................................................... 7

System Features...................................................... 8

Installation .................................................................... 12

Advanced Installation Topics....................................... 17

Configuration ............................................................... 20

Model 51 Configuration ChartMain Functions ..... 22

Model 51 Configuration Chart

Alternate Functions ............................................. 23

Operation ..................................................................... 25

Model 50 Central Controller .................................... 25

Model 51 Control Console....................................... 26

Talent Amplifiers ...................................................... 29

Troubleshooting........................................................... 30

Technical Notes ........................................................... 31

Specifications............................................................... 36

Appendix A .................................................................. 39

MIDI Messages ........................................................ 41

Block Diagrams

Model 50 Central Controller

Model 51 Control Console

Model 35/Model 38 Talent Amplifiers

Model 70 Interface/Model 71 Mic Module

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Model 50/51 User Guide Issue 3, August 1995

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Foreword

I am pleased to present the StudioComm series of products. As both president and owner

of Studio Technologies, I take a very personal approach when designing products. Getting

older (37 as of this writing) has increased my appreciation of the more subtle things in

lifebe they a part of nature or the nuances contained in a well-designed piece of elec-

tronic equipment. Do the technical and operational aspects of a product work together to

feel right? A Studio Technologies design is ready to go only when I am completely

satisfied. My entire focus for the StudioComm series was to make a system that youd

really enjoy using, and one that would perform reliably for years. I hope you share my

enthusiasm.

Many fine people worked toward making the StudioComm happen. Mitch Budniak (ace

consulting engineer) designed many of the circuits. Jim Cunningham contributed to the

analog design. Carrie Loving provided engineering support. Barbara Govednik coordi-

nated the marketing communications aspects. Ben Kamen designed the automatic testing

routines. Larry Leviton wrote the excellent micro-controller software. Al Lux designed

the printed circuit boards. Jim McGuire designed the graphics. Fred Roeck performed the

mechanical design. Joe Urbanczyk coordinated the safety testing and agency approvals.

J.C. Utter wrote and electronically illustrated the technical manual, with extensive input

from me.

Many thanks to Bob Tjarks, professional audio sales manager at Gand Music & Sound,

Northfield, Illinois. Bob brought to my attention the need for a product to serve digital

audio workstations. His product idea evolved into the StudioComm series. Additional

thanks to Timothy Powell of Metro Mobile Recording, Glenview, Illinois, who provided his

excellent ears when issues of sonic quality arose. His extensive field and studio experience

was extremely helpful in keeping me on the audio straight and narrow.

Please contact me with your questions, comments, and suggestions. I can be reached by

voice at (847) 676-9177, fax at (847) 982-0747, or via the Internet This page intentionally left

blank.@ www.studio-tech.com.

Sincerely,

Gordon K. Kapes

President

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Model 50/51 User Guide Issue 3, August 1995

Studio Technologies, Inc. Page 7

Introduction

The Model 50 Central Controller, along

with the companion Model 51 Control

Console, are members of the

StudioComm family of products. The

Models 50 and 51 are specifically de-

signed to work in conjunction with digital

audio workstations to provide a full set of

monitoring and communications functions.

Features include control room and studio

monitoring, an integrated headphone

system, dubbing, and communications

functions that include talk to studio, talk to

phones, and slate. All StudioComm func-

tions perform to a level that rivals even the

largest recording consoles. Many of the

functions are user configurable, allowing

unmatched flexibility.

What This User Guide Covers

This User Guide is designed to assist

you when installing, configuring, and

using the Model 50 Central Controller,

Model 51 Control Console, Model 35

Talent Amplifier, Model 38 Talent Ampli-

fier, and related components. A limited

amount of troubleshooting and back-

ground technical information is also pro-

vided. Should you require detailed

technical information please refer to the

StudioComm Service Guide covering the

Models 50, 51, 35, and 38. The Service

Guide contains detailed service informa-

tion, including schematic diagrams. The

Service Guide is not shipped with each

StudioComm system, but is available from

the factory upon request. It is free of

charge to purchasers of StudioComm

equipment. Give us a call or send a fax

if you need this highly exciting document!

System Overview

The StudioComm system is designed to

provide control over monitor and dub

sources, communication from the control

room to the studio, and a headphone

monitoring (cue) system. A complete

StudioComm system consists of a rack-

mounted central controller, a desktop

control console, and one or more portable

talent amplifier units.

The Model 50 Central Controller and the

Model 51 Control Console work together

to provide performance and features for

use in advanced applications. The units

interconnect using a standard 5-pin MIDI-

style cable. Circuitry in the Model 50

separately routes any of seven stereo

inputs to the control room, studio, head-

phone, and dub outputs, with commands

provided by the Model 51 Control Con-

sole. If you have MIDI software that sup-

ports the Studio-Comm system, you can

even, in lieu of the Model 51, control the

Model 50 with your computer.

The Model 51 Control Consoles built-in

microphone lets you talk to the studio or

headphone outputs. It also allows you

to talk to the dub output, or to the dub

and headphone outputs using the slate

function.

The Model 35 Talent Amplifier is a por-

table amplifier unit capable of driving one

or two pairs of high-impedance stereo

headphones. A single microphone-type

cable links the Model 35 with the Model 50

Central Controller. The Central Controller

provides power and left and right audio

over just three wires.

The Model 38 Talent Amplifier takes the

basics from the Model 35 and adds a

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unique stereo preamplifier section. This

allows each Model 38 user to create an

individual headphone mix, solving the

classic problem of wanting more me

in the phones! Like the Model 35, the

Model 38 is linked to the Model 50 Central

Controller by a single microphone-type

cable.

System Features

Stereo Line Inputs

The Model 50 contains seven stereo line-

level inputs which are compatible with

both balanced and unbalanced signals.

Each input is independently software

configurable for a nominal input level of

10dBV or +4dBu. This allows direct

connection with virtually any audio source.

Each input can also be configured to

operate as a mono input. In this manner,

a signal connected to the left input is

routed to both the left and right outputs.

For convenience, input 7 is located on

the front panel of the Model 50; inputs 1

through 6 are located on the back panel.

Control Room Monitoring

The control room section provides two

stereo line-level outputs for driving two

power amplifiers associated with monitor

loudspeakers. Seven buttons are used to

select the input source to be monitored.

The control room level is adjusted using a

smooth-feeling rotary potentiometer. The

Dim button allows the control room level

to be temporarily reduced. The Control

Room A/B button allows the control room

A or B outputs to be activated. The Mono

button allows the sum (L+R) of the se-

lected source to be sent as the control

room output.

Studio Monitoring

The studio monitoring source is config-

ured to follow the selected control room

source or headphone source. A push

button, along with an associated LED,

provides the studio on/off function. A

rotary potentiometer is used to set the

level.

Dub Output

A stereo line-level output is provided as

a dub (copy) output. Any of the seven

inputs can be assigned to the dub output.

The slate function allows communications

(voice) audio to be sent out the dub out-

put. For convenience, the dub output is

available from both the front and back

panels of the Model 50.

Communications Functions

The Model 51 Control Console contains

an internal microphone that is used in

conjunction with the three communications

functions. The talk to studio function

interrupts the studio source and sends

communications audio. The talk to

phones function either interrupts the

phones source or adds (sums or mixes)

communications audio with the phones

source. The slate function interrupts the

dub source and, if configured, the head-

phone source and connects communica-

tions audio. The slate function can be

configured to send a 50Hz sine wave

along with communications audio. The

audio level of each communications func-

tion is individually adjustable.

MIDI Control

All Model 50 Central Controller functions

are controlled using system-exclusive MIDI

messages. The Model 51 Control Console

speaks this language, and in most

Model 50/51 User Guide Issue 3, August 1995

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Mic Module

input

Model 50 Back Panel

Model 50 Front Panel

Power

present LED Stereo line input 7;

LED indicates

+4dBu configuration

Input data

present LED

Talent Amplifier

over current LED

Dub output;

LED indicates +4dBu

configuration

Model 51

Control Console

over current LED

Model 50

input data LED

AC mains

connection

To/from Model 51

Control Console Output to talent

amplifiers Control room

A & B outputs

Studio output

Mains voltage

configuration

chart

applications a Model 51 will be utilized. In

special applications the Model 50 Central

Controller can be connected directly to a

MIDI bus, allowing the creation of a fully

automated recording or audio routing

system. (For more information on MIDI

support, refer to Appendix A.)

Configuration

The Model 51 Control Console can be

configured to make the system meet a

users exact operating environment. As

previously discussed, each of the seven

stereo line inputs can be independently

set for 10dBV or +4dBu operating levels.

They also can be set for either mono or

stereo operation. In the mono mode a

signal connected to the left input is sent to

the left and right outputs. The dub output

level can be set for a nominal 10dBV or

+4dBu output level.

Unique to the system is the ability to

configure the dim level to one of six val-

ues, ranging from full mute to a modest

10dB reduction. The auto dim off function,

when configured, allows any change in

the control room level potentiometer to

automatically turn off an active dim state.

The talk to phones function can be config-

ured to either interrupt the source selected

for headphone audio and connect com-

munications audio, or to have the commu-

nications audio added (summed or mixed)

with the headphone audio.

The slate function can be configured to

talk to the dub output, or talk to both the

Stereo line

inputs 1-6

Dub

output

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Built-in microphone for

communications functions

(talk to studio, talk to

phones, slate)

Talk to the studio or

headphones; slate; set

communications levels

Model 51 Front Panel

Studio on/off button

and level control

Configure button

switches between

normal operation

and configure mode

Change the control

room level; listen in

mono (L+R); select

output A or B; or reduce

the level by a preset

amount

Source selection

for control room (CR),

studio, headphones, and

dub; three columns of

LEDs show the currently

selected sources

Model 51 Back Panel

Connection for

external talk to studio

and talk to phones

switches

Connection

to the Model 50

Central Controller

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Studio Technologies, Inc. Page 11

dub and headphone outputs. Slate can

also be set to generate a 50Hz sine wave

when activated. This provides an audible

marker for analog tapes, and a visual

indication on a wave form display screen.

Four functions can be set for push-to-latch

operation if desired: talk to studio, talk to

phones, slate, and control room mono.

The studio output is set to follow the con-

trol room source or the headphone

source. The headphone source is set for

independent selection or to follow the

control room source.

All configuration parameters, along with

power down operation conditions, are

stored in nonvolatile memory.

Headphone Monitoring

The StudioComm system contains an

integrated, full-featured headphone (cue)

system. Up to four Model 35 or Model 38

Talent Amplifiers can be connected to

the Model 50s talent amplifier output. A

single 3-conductor microphone-type cable

carries power and stereo audio.

Using the Model 51 Control Console,

any of the seven stereo inputs can be

assigned to the talent amplifier output.

The talk to phones and slate functions

allow communications (voice) audio to be

sent to the talent amps. The talent amplifi-

er output is short circuit protected. Error

conditions are displayed by the Talent

Amplifier Over Current LED on the Model

50s front panel.

Connects to additional

talent amplifiers

Connects to the Model 50 or another talent

amplifiers loop thru connector

Model 35 Front Panel

Model 35 Back Panel

Two headphone

outputs

Power present

LED

Headphone output

level control

Switch between

stereo and mono

(L+R) output

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Model 38 Back Panel

Connects to talent

sources such as key-

boards or microphones

Loop thru connectors parallel the

talent inputs for routing to a digital

audio workstation, effects device,

microphone preamp, etc.

Connects to the

Model 50 or another

talent amplifiers loop

thru connector

Connects to additional

talent amplifiers

Talent level

to phones

Power present

LED

Each Model 35 and Model 38 Talent

Amplifier can drive two sets of high-

impedance headphones (>150Ω). The

audio output is loud, and very clean.

The units feature a built-in level control,

a stereo/mono switch, and a power

present LED.

The Model 38 Talent Amplifier takes the

basics from the Model 35 and adds a

unique stereo preamplifier section. This

allows a musicians microphone or line-

level signal to be looped through the

Model 38, boosted by its preamp, and

then combined with the stereo cue mix

supplied by the Model 50. This provides

each Model 38 with an individual head-

phone mix, solving the classic problem

of wanting more me in the phones! Like

the Model 35, the Model 38 is linked with

a Model 50 Central Controller by a single

cable.

Installation

In this section you will be installing the

Model 50 Central Controller in an equip-

ment rack. Audio input and output con-

nections will be made using the Model

50s multitude of phone jacks. One or

Mic/Line button switches

the talent input between

microphone and line level

Model 38 Front Panel

Switch between

stereo and mono

(L only) for the

talent input

Cue mix

level to

phones

Switch between

stereo and mono

(L+R) for the cue mix

Two headphone outputs

Model 50/51 User Guide Issue 3, August 1995

Studio Technologies, Inc. Page 13

more Model 35 or Model 38 Talent Amplifi-

ers will be connected. A location will be

selected for the Model 51 Control Con-

sole, and it will be connected to the Model

50. AC mains power will be connected to

the Model 50.

System Components

The main StudioComm shipping carton

contains a Model 50 Central Controller,

Model 51 Control Console, 5-conductor

MIDI-style cable, User Guide, and war-

ranty card. Units destined for North

America are shipped with an AC mains

cord. Your dealer or distributor will provide

an AC mains cord for non-North American

destinations. Model 35 and Model 38

Talent Amplifiers, along with accessories,

will be contained in separate cartons.

Please check to ensure you have every-

thing you need.

Mounting the Model 50

The Model 50 requires one space in a

standard 19-inch (48.3cm) equipment

rack. Select a location near where the

Model 51 Control Console will be located.

A cable is provided to connect the Model

50 to the Model 51. If required, you can

supply a longer cable, however 50 feet

(15.3m) is the recommended maximum

length. It is desirable to locate the Model

50 to allow easy access to both the front

and the back panels. The back panel

contains most of the input and output

connectors, while the front panel is used

to access line input 7 and a multiple (mult)

of the dub output. In addition, the front

panel also contains several LED indica-

tors. The Model 50 is secured to the

equipment rack using two mounting

screws per side.

Balanced Connection

(Input & Output)

Sleeve

(Shield)

(Switchcraft No. 297, Neutrik NP3C, or equivalent)

Unbalanced Connection

(Input & Output)

Sleeve

(Shield)

Tip ( + )

(Switchcraft No. 280, Neutrik NP2C, or equivalent)

Tip ( + )

Audio Inputs and Outputs

The Model 50s line-level audio input and

output connections are made using ¼-

inch 3-conductor phone jacks. The choice

of phone jacks was simply a matter of real

estate21 XLR connectors dont quite fit

on the back of a one rack-space unit!

Dont be concerned about your audio

quality, the jacks we use are manufac-

tured by Neutrik of Switzerland and fea-

ture gold-plated contacts.

Caution: For reliable audio interconnec-

tion, the plugs you use must comply with

industry standard RS-453. Switchcraft No.

297, Neutrik NP3C, or equivalent will work

correctly. Refer to the Technical Notes

section for details.

For all input and output phone plugs,

tip is positive (+ or hot), ring is negative

( or cold), and sleeve is shield. The

Ring ()

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Model 50 will also accept unbalanced

¼-inch 2-conductor phone plugs for inputs

and outputs. With unbalanced phone

plugs, tip is positive (+ or hot) and sleeve

is shield. If 3-conductor phone plugs are

used to connect unbalanced input or

output signals, connect positive (+ or hot)

to tip and shield to ring and sleeve.

Stereo Line Inputs

The Model 50 provides seven stereo line-

level inputs. Inputs 1 through 6 are located

on the back panel; input 7 is on the front.

Each input is electronically balanced, and

can be configured for compatibility with

10dBV or +4dBu signal levels. The

Model 51 Control Console gives you push-

button control, so you can easily change

input sensitivities at any time (refer to the

Configuration section under Input Sensitiv-

ity). Monaural sources should be con-

nected to the left (L) input and configured

for mono operation (refer to the Configura-

tion section under Stereo/Mono Input).

Control Room Outputs

The Model 50 contains two stereo line-

level outputs for connection to two audio

power amplifiers. These audio amps

serve two pairs of loudspeakers that are

located in the control room. (Of course the

control room outputs can be connected to

loudspeakers that contain integral power

amplifiers, such as the products from

Genelec.)

The outputs, labeled A and B, are elec-

tronically balanced and capable of driving

loads of 600 ohms or greater. In most

situations best performance will be ob-

tained if the audio amplifiers input sensi-

tivity is set to near maximum. Refer to the

Technical Notes section for details on

setting amplifier sensitivity.

Studio Output

The Model 50 contains a stereo line-level

output for connection to an audio power

amplifier. This audio amplifier serves the

pair of loudspeakers that is located in the

studio area. (Of course the studio output

can be connected to loudspeakers that

contain integral power amplifiers.)

The output is electronically balanced and

capable of driving loads of 600 ohms or

greater. In most situations best perfor-

mance will be obtained if the audio

amplifiers input sensitivity is set to near

maximum. Refer to the Technical Notes

section for details on setting amplifier

sensitivity.

Dub Output

The Model 50 contains a stereo line-level

output which is intended for connection to

a variety of analog audio devices. The dub

output is electronically balanced and

capable of driving 600 ohm loads or

greater. With the input impedance of most

audio devices at 10k ohms or greater, the

dub output can easily drive 10 or more

devices simultaneously. The dub output

can be configured for a nominal level of

10dBV or +4dBu, so you can connect to

all line-level inputs with no hassle (refer

to the Configuration section under Dub

Output Level).

The dub output is available on phone

jacks located on both the front and back

panels of the Model 50. The phone jacks

are connected in parallel, being a multiple

or mult of each other; one set of dub

output circuits drive both outputs. The

design intention was that permanent

connections would be made to the back

panel dub output, while the front panel

dub output would remain available for on

the spot use.

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Studio Technologies, Inc. Page 15

Mic Module Input

A ¼-inch 3-conductor phone jack, labeled

Mic Module, is located on the back panel.

In most cases the Mic Module input will not

be used, and no plug should be inserted.

For details on using the Mic Module input,

refer to the Advanced Installation Topics

section later in this guide.

Talent Amplifier Output

Up to four Model 35 or Model 38 Talent

Amplifiers can be connected in any combi-

nation to the Model 50s talent amplifier

output. The output connector is a 3-pin

male XLR-type. For best performance, use

low-capacitance shielded microphone-type

cable to distribute the talent amplifier

signal. If you have a choice, select cables

with the heaviest wire gauge commonly

available. This will reduce voltage drop

when using long cable runs. Refer to the

Technical Notes section for additional

information.

The simplest installation would use a mi-

crophone cable to connect the Model 50

to the first talent amplifier; the loop through

connector on that talent amp sending the

signal on to the next talent amp.

For convenience, you may want to wire

your facility to allow easy access to the

talent amplifier signal at all locations where

talent amplifiers might be used. The talent

amplifiers connect to the Model 50 in

parallel, so the connectors on the distribu-

tion panels or mult boxes must be wired in

parallel.

Warning: Do not connect the Model

50s talent amplifier output to anything

but Studio Technologies talent amplifi-

ers. Some audio equipment may be

damaged by the +23Vdc contained

on pin 2 of the talent amplifier output

connector.

Several mounting options are available

for the Model 35 and 38 Talent Amplifiers.

For details refer to the Mounting Options

sections in the Advanced Installation

Topics section of this manual.

In special cases you may need to obtain

a stereo, balanced line level output signal

from the Model 50 talent amplifier output.

The Model 70 Interface is available for this

purpose. For details refer to the Advanced

Installation Topics section later in this

guide.

Locating the Model 51 Control Console

The Model 51 was designed for desktop

use, however provision has also been

made for microphone-stand mounting.

For details refer to Mounting Options in

this section.

Connecting the Model 50 to the

Model 51

A standard 5-conductor MIDI-style cable

is used to connect the Model 50 to the

Model 51; a cable is included with your

system. Just connect the cable between

the female 5-pin DIN-type connectors on

the back of the Model 50 and 51, and

youre done.

Note: If you require a longer cable, be

certain to buy a MIDI cable that has all 5

pins wired. If they arent all connected, the

Issue 3, August 1995 Model 50/51 User Guide

Page 16 Studio Technologies, Inc.

Model 51 will not operate. This is because

the Model 50 powers the Model 51 with

the pins that arent used for MIDI data.

For best performance, the cable that

connects the Model 50 with the Model 51

should be limited to 50 feet (15.3m).

Should you need to exceed this length,

refer to the Technical Notes section

of this guide for details on the cable

requirements.

For more information on MIDI, and using

controllers other than the Model 51,

please refer to Appendix A.

Connecting External Communications

Switches

The Model 51 allows the connection

of external talk to studio and talk to

phones push button switches. Refer to

the Advanced Installation Topics section

of this guide for details.

AC Mains Power

The Model 50 is internally configured to

operate from either 100, 120, or 220/240V,

50/60Hz. In most cases, units shipped to

North America are factory selected for

120V operation. Units bound for Japan are

selected for 100V, while our friends down

under and in Europe receive units set for

220/240V. Before connecting the Model 50

to mains power, check that it is configured

to match the local mains voltage. Look on

the back panel, adjacent to the power

entry connector, for the configured

voltage(s). Note than an incorrect configu-

ration could seriously damage the unit.

Should it be necessary to change the

units operating voltage it must be

performed only at the factory or by an

authorized service technician.

The Model 50 uses an IEC standard con-

nector to mate with the AC mains cord.

The wire colors in the AC mains cord

should conform to the internationally

recognized CEE color code and must

be wired accordingly:

Connection Wire Color

Neutral (N) Light Blue

Line (L) Brown

Protective Earth (E) Green/Yellow

Safety Warning: The Model 50 does

not contain an AC mains disconnect

switch. As such the mains cord plug

serves as the disconnection device.

Safety consideration requires that

the plug and associated outlet be

easily accessible to allow rapid discon-

nection of mains power should it prove

necessary.

As soon as mains power is applied, the

Model 50s power present LED will light.

The Model 51 will go through its power-up

sequence lighting each LED in a rapid

sequence. The power present LEDs on

the talent amplifiers will also light.

The two Over Current LEDs located on

the front panel of the Model 50 should not

be lit. If either or both are flashing, imme-

diately refer to the Troubleshooting sec-

tion of this guide. If everything appears to

be functioning properly you are now ready

to configure the system.

Model 50/51 User Guide Issue 3, August 1995

Studio Technologies, Inc. Page 17

Advanced

Installation Topics

Model 35 Stand Mounting

Included with each Model 35 Talent

Amplifier is a nifty mounting adapter that

allows the unit to be conveniently attached

to a microphone stand. Please refer to the

Installation Guide provided in the Model

35s shipping carton for details.

Model 38 and Model 51 Mounting

Options

The Model 38 Talent Amplifier and the

Model 51 Control Console include provi-

sions for mounting to microphone stands,

equipment consoles, etc. To avoid rein-

venting the wheel, our products are

compatible with the 25 Series components

from OmniMount Systems, Tempe,

Arizona U.S.A. (602) 829-8000, a supplier

of finely engineered mounting systems.

This firm makes many versions of the 25

Series; one of which should fit your needs.

If you desire microphone stand mounting

the following components would be ap-

propriate for English-thread applications:

25RST-25H Straight Tube Reverse Mount

with Quick Release, along with a 25MA

Microphone Stand Adapter. (If quick

adjustment is not required the 25RST

Straight Tube Reverse Mount can be used

in place of the first item.) When connecting

to metric-thread stands please contact

OmniMount for the correct part numbers.

The bottom surface of the Model 38 Talent

Amplifier contains two threaded inserts

that will accept English-standard ¼-20

screws. Using two, 5/8-inch long, round-

head machine screws, the 25 Series

clamp assembly can be directly attached.

The cover of the Model 38 does not have

to be removed.

The design of the Model 51 did not allow

the inclusion of threaded inserts, so holes

of adequate size to allow ¼-20 round head

machine screws are provided. It is in-

tended that screws of 5/8-inch length, along

with lock washers and machine nuts, will

securely attach a 25 Series mounting

clamp assembly. The cover of the Model

51 will have to be removed to gain access

to mounting holes. Be careful when select-

ing the mounting screwsexceeding the

recommended 5/8-inch length will cause

the mounting screws to damage the

Model 51s internal components.

External Communications Switches

The Model 51 allows you to connect

external talk to studio and talk to phones

communications switches. It may be

useful to install these switches at a pro-

ducer or director location. The Model 51

continues to provide local talk to studio

and talk to phones access even when

external switches are connected.

The required connector is a ¼-inch

3-conductor phone plug. Tip is talk to

studio, ring is talk to phones, and sleeve

is common. Switchcraft No. 297, Neutrik

NP3C, or equivalent will work correctly.

Use a momentary, single-pole, single-

throw switch for each remote function. The

respective function is activated when the

tip or ring get shorted to the sleeve.

While the Model 51s talk to studio and

talk to phones buttons can be configured

to latch, the external switches are always

push to activate. This is provided as a

safety feature preventing an external user

from latching one of the functions to the

on state.

Issue 3, August 1995 Model 50/51 User Guide

Page 18 Studio Technologies, Inc.

External Communications Switches

Sleeve

(Ground)

Tip (Talk to studio)

Ring (Talk to phones)

(Switchcraft No. 297, Neutrik NP3C, or equivalent)

Tip

(+12Vdc)

Sleeve

(Ground)

Mic Module Input

Ring (Communications

Audio Input)

(Switchcraft No. 297, Neutrik NP3C, or equivalent)

Mic Module Input

The Model 51 Control Console contains

a microphone which provides the audio

source for the Model 50s communications

functions. In special applications the

Model 51 may not be used, and a sepa-

rate source of communications audio will

be necessary. The Mic Module input on

the back panel of the Model 50 allows the

Model 71 Mic Module to be directly con-

nected. The Model 71 consists of a small

enclosure, about the size of a personal-

computer mouse, containing a micro-

phone and preamplifier. Contact Studio

Technologies for further details about the

Model 71.

Even if you are using the Model 51 Control

Console you may want to provide an

alternate source of communications audio.

To use your own microphone and

preamp, directly connect it using the Mic

Module input jack. The Mic Module input

is a ¼-inch 3-conductor phone jack with

+12Vdc on tip, audio input on ring, and

ground on sleeve. The audio input re-

quires a nominal 10dBu signal (10dBu,

not 10dBV!). The +12Vdc on the tip is

from the same source that powers the

Model51, and is provided to power the

Model 71 Mic Module. If you feel the urge

to use this power source, be aware that it

only provides 110 milliamps of current of

which the Model 51 needs about 100mA.

So go ahead and use all the current you

need, as long as it doesnt exceed 10mA!

Note: Communications audio from the

Model 51 is routed into the Model 50s

circuitry through the normal connection on

the ring contact of the Mic Module input

jack. When a phone plug is inserted into

the Mic Module input, the audio path from

the Model 51 to the Model 50 is broken.

This means you cant use the Model 51s

microphone and the Mic Module input at

the same time.

Model 70 Interface

In most cases Model 35 and/or Model 38

Talents Amplifiers will be used to drive

headphones associated with a Studio-

Comm installation. In special cases a line

level signal may be required to interface

the Model 50 Central Controllers talent

amplifier output with other audio equip-

ment. An example would be to use the

Model 50 with an existing headphone

Model 50/51 User Guide Issue 3, August 1995

Studio Technologies, Inc. Page 19

Model 70 Front Panel

Model 70 Back Panel

system. The Model 70 Interface is used

to convert the talent amplifier signal to a

stereo, balanced line level signal.

Installation is very simple. Connect the

Model 70 to the Model 50 Central Con-

trollers talent amplifier output using a

standard 3-conductor microphone-type

cable. For best performance, use low-

capacitance shielded cable.

The Model 70 provides independent left

and right balanced outputs. Pin 1 is shield,

pin 2 is signal positive (+ or hot), and pin

3 is signal negative ( or cold). The elec-

tronically balanced outputs have a nomi-

nal signal level of +4dBu and are capable

of driving loads of 600 ohms or greater.

The Model 70 can be used by itself, or in

conjunction with up to four Model 35 or

Model 38 Talent Amplifiers. The loop

through connector on the Model 70 can

be used to connect to a Model 35 or 38

Talent Amplifier.

Issue 3, August 1995 Model 50/51 User Guide

Page 20 Studio Technologies, Inc.

Configuration

Many StudioComm functions can be

configured to meet the exact needs of

your installation. Heres an overview of

what you can configure:

•10dBV or +4dBu level for each input

•Stereo or mono for each input

• 10dBV or +4dBu level for the dub

output

•Dim level

•Auto dim off function

•Studio source follows control room or

headphone source

•Headphone source is independently

selected or follows control room

source

•Momentary or latching operation for

mono, talk to studio, talk to phones,

and slate buttons

•Talk to phones interrupts or adds to

phones source

•Slate feed to phones

•50Hz slate tone on or off

The Configure button allows the Model 51

to go into the configure mode. While in the

configure mode, all the Model 51s but-

tons and LEDs are associated with config-

ure functions. Refer to the Model 51

Configuration Chart later in this section.

To enter the configure mode, press and

hold the Configure button for two sec-

onds. While in the configure mode, all

audio outputs switch off and the orange

LED beside the Configure button will flash.

As you make changes, the Model 51

keeps track of the new settings and up-

dates the system when you exit the config-

ure mode. You must exit the configure

mode before any changes take effect.

Input Sensitivity

The CR/Studio column of seven red LEDs

shows you whether an input is set to be

compatible with 10dBV or +4dBu signal

levels. When a red LED in the CR/Studio

column is off, it means the input is set to

10dBV. When lit, the corresponding input

is set to +4dBu. Just press the CR/Studio

buttons to toggle inputs 1 through 7

between 10dBV and +4dBu.

For convenience, Input 7 is located on the

front panel of the Model 50. It has a green

LED beside it labeled +4 Input Level.

When lit, it tells you that Input 7 is set for

+4dBu. This means each time you con-

nect a new signal to Input 7, you dont

have to go into the configure mode to

determine the input sensitivity. You should

note, however, that configure settings

arent updated until you leave the config-

ure mode, so the +4 Input Level LED

wont reflect a change until you exit.

Stereo/Mono Input

The Phones/Studio column of seven green

LEDs indicates whether an input is config-

ured for mono or stereo operation. When

an LED in this column is off, the input is

set for stereo; the LED on means the

corresponding input is set for mono. In

mono mode, the left input is sent out both

the left and right outputs. To toggle a

channel between stereo and mono, press

and hold the Phones/Studio button and

press the CR/Studio buttons that corre-

spond to inputs 1 through 7. After you

leave the configure mode, inputs config-

ured for a mono source will flash during

normal operation.

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Studio Technologies StudioComm 50 User manual

Brand: Studio Technologies

Model: StudioComm 50

Type: User manual

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Studio Technologies StudioComm 50 User manual

Studio Technologies StudioComm 50 User manual

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